Question

what would be the formula of this compound?
□ al₂(co₃)₂
□ alco₃
□ al₂(co₃)₃
□ al₃co₃

Explanation:

Step1: Determine aluminum ion charge

Aluminum (Al) forms a 3+ ion, $Al^{3 + }$.

Step2: Determine carbonate ion charge

The carbonate ion is $CO_{3}^{2 - }$.

Step3: Balance charges

To balance the charges, we need 2 aluminum ions ($2\times3+=6+$) and 3 carbonate ions ($3\times2 - = 6 -$). So the formula is $Al_{2}(CO_{3})_{3}$.

Answer:

$Al_{2}(CO_{3})_{3}$